Inclosed fuse.



' 'PATENTBD Anal 11, 1908.

R. I 0.. N INCLOSED FUSE.

COLE.

Arrmcnlon run) an.

Attestf UNITED STATES PATENT ore-10E.

ROlll-IRI G. COLE, ()l" ll.\ R'IFUR D, (ION NWI'QHIUT, ASSIGNOR TO THE JOHNS-PRATT CUMPANY,

mcmsED FUSE.

Specification of Letters Patent.

Patented Aug. 11, 1908.

, App't :ation filed January 31, 1907. Serial No. 355,019.

ed withoutloss of the comminuted refractory material with which the f use i-nelosure is usually packed, and my invention rests on the discovery, which I have made, that by coverim the usual ventholes of such inelosure with a screen composed of a number of overlaid or woven filaments o1" threadssueh as ordinary cotton threads and having lint or fuzz thereon, the gases of disruption are permitted to discharge readily and freely through the vent-holes, but the powder and fine particles of the filling material are retained within the casing. By thus freely venting the gases of disruption, the pressure and rise of temperature withinthe fuse in closure is kept substantially normal, so that the tendency for an arc. to form between the inelosed fuse-link terminals is greatly reduced, if not'entirely obviated.

In Figure 1 1 exhibit an ordinary inclosed fuse in longitudinal section, supplied with the screen of my invention; and m Fig. 2 a magnified section of said screen.

The. construction of the fuse of Fig. 1 comprises a fuse-link 1, connected to fuse-link terminals 3, l at each end and surrounded by a toss of com ninuted refractory material 3, such as crashed lime or gypsum. The fuse link inclosure comprises a cylindrical fusetube or casing 421ml end closures therefor, in the form of metallic ferrules 5, to which the said fuse-link terminals .2, 2 are respectively connected so tlia'. current may pass from ferrule to ferrule througn the link, in the usual and well understood manner.

-The ferrules are each provided with one or more ent-hoies, indicated by 6, and according o my invention the screen 7, placed against the inner ends of the ferrules over thevent-holes, is comprised of a single layer of cotton gauze, preferably the commercial hospital gauze such' as is ordinarily used by surgeons for bandages, etc. lhis material is made of loosely woven threads or filaments consisting of twisted cotton fibers with the free ends of many of the fibers projecting laterally from them forming'a lint or nap thereon, thus forming a reticulated or sievelike fabric with the interstices occupied largely by the nap, which serves in practice to prevent the escape of the fine. filling material through the vent-holes, but at the same time does not seem to offer any substantial obstruction to the expanding gases.

Fig. 2 is int-ended to illustrate on a magnified scale the general structure of the gauze. screen referred to, but it is to be understood that my inventioncontemplates other forms of screens and'screens of other material than cotton, provided the same have an elastic lint orfuzz upon them like the lint on cotton threads.

Having described my invention, what I claim and desire to secure by United States Letters Patent, is-- 1. In an inclosed fuse, the combination with. the fuse link and commmuted filling material, of' a fuse inclo'sure therefor having means for venting the same comprising one or more open vent--holes adapted to provide a free escape for the expanding gases and a. reticulate screen formed of linty or'fuzzy material with its interstices occupied by the lint or fuzz thereon and serving to retain the said com'minuted material without appreciably obstructing the gases.

2. In an i'nclosed fuse, the combination with the fuse-link and comminuted.filling material, of an melosure therefor-having means for venting the same compr sing a plurality of vent-holes ada )ted to provide a. free escape for the gases of combustion and a screen for said vent-holes composed of twisted fibers having lint or nap upon them serving to retain the said comminutcd ma.- terial without appreciably obstructing the gases.

3. In an inelosed fuse, the combination with the fuse link and comminuted filling i naterial, of an inelosure therefor having means for venting the gases of combustion i v I f 895, l31' comprising one or more. 0 en holes and a name. to the specification in the presence of v cotton auze screen of suc 1 texture as wlll two subsqnbmg qt-messes. g y retain t 1c said comminuted material withinup 1 M1 O 3 the-lnclosure whlle permlttlng free and sub- C 3 5 stantlally lmmedmte escape o; the gases Wfitnesses: i through the sand vent-holes. ARTHUR B. PEGK, In test-nnony whereof, I have signed. my Joxm S. Frrzsnmoh's. Y; i 2 

